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-rw-r--r--net/ipv4/ip_gre.c112
1 files changed, 19 insertions, 93 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index b1a74d80d868..cb1af42e374b 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -458,81 +458,14 @@ static int gre_handle_offloads(struct sk_buff *skb, bool csum)
return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
}
-static struct rtable *gre_get_rt(struct sk_buff *skb,
- struct net_device *dev,
- struct flowi4 *fl,
- const struct ip_tunnel_key *key)
-{
- struct net *net = dev_net(dev);
-
- memset(fl, 0, sizeof(*fl));
- fl->daddr = key->u.ipv4.dst;
- fl->saddr = key->u.ipv4.src;
- fl->flowi4_tos = RT_TOS(key->tos);
- fl->flowi4_mark = skb->mark;
- fl->flowi4_proto = IPPROTO_GRE;
-
- return ip_route_output_key(net, fl);
-}
-
-static struct rtable *prepare_fb_xmit(struct sk_buff *skb,
- struct net_device *dev,
- struct flowi4 *fl,
- int tunnel_hlen)
-{
- struct ip_tunnel_info *tun_info;
- const struct ip_tunnel_key *key;
- struct rtable *rt = NULL;
- int min_headroom;
- bool use_cache;
- int err;
-
- tun_info = skb_tunnel_info(skb);
- key = &tun_info->key;
- use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
-
- if (use_cache)
- rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl->saddr);
- if (!rt) {
- rt = gre_get_rt(skb, dev, fl, key);
- if (IS_ERR(rt))
- goto err_free_skb;
- if (use_cache)
- dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
- fl->saddr);
- }
-
- min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
- + tunnel_hlen + sizeof(struct iphdr);
- if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
- int head_delta = SKB_DATA_ALIGN(min_headroom -
- skb_headroom(skb) +
- 16);
- err = pskb_expand_head(skb, max_t(int, head_delta, 0),
- 0, GFP_ATOMIC);
- if (unlikely(err))
- goto err_free_rt;
- }
- return rt;
-
-err_free_rt:
- ip_rt_put(rt);
-err_free_skb:
- kfree_skb(skb);
- dev->stats.tx_dropped++;
- return NULL;
-}
-
static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev,
__be16 proto)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
struct ip_tunnel_info *tun_info;
const struct ip_tunnel_key *key;
- struct rtable *rt = NULL;
- struct flowi4 fl;
int tunnel_hlen;
- __be16 df, flags;
+ __be16 flags;
tun_info = skb_tunnel_info(skb);
if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
@@ -542,13 +475,12 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev,
key = &tun_info->key;
tunnel_hlen = gre_calc_hlen(key->tun_flags);
- rt = prepare_fb_xmit(skb, dev, &fl, tunnel_hlen);
- if (!rt)
- return;
+ if (skb_cow_head(skb, dev->needed_headroom))
+ goto err_free_skb;
/* Push Tunnel header. */
if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM)))
- goto err_free_rt;
+ goto err_free_skb;
flags = tun_info->key.tun_flags &
(TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
@@ -556,14 +488,10 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev,
tunnel_id_to_key32(tun_info->key.tun_id),
(flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0);
- df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
+ ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen);
- iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE,
- key->tos, key->ttl, df, false);
return;
-err_free_rt:
- ip_rt_put(rt);
err_free_skb:
kfree_skb(skb);
dev->stats.tx_dropped++;
@@ -575,10 +503,8 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev)
struct ip_tunnel_info *tun_info;
const struct ip_tunnel_key *key;
struct erspan_metadata *md;
- struct rtable *rt = NULL;
bool truncate = false;
- __be16 df, proto;
- struct flowi4 fl;
+ __be16 proto;
int tunnel_hlen;
int version;
int nhoff;
@@ -591,21 +517,20 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev)
key = &tun_info->key;
if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
- goto err_free_rt;
+ goto err_free_skb;
md = ip_tunnel_info_opts(tun_info);
if (!md)
- goto err_free_rt;
+ goto err_free_skb;
/* ERSPAN has fixed 8 byte GRE header */
version = md->version;
tunnel_hlen = 8 + erspan_hdr_len(version);
- rt = prepare_fb_xmit(skb, dev, &fl, tunnel_hlen);
- if (!rt)
- return;
+ if (skb_cow_head(skb, dev->needed_headroom))
+ goto err_free_skb;
if (gre_handle_offloads(skb, false))
- goto err_free_rt;
+ goto err_free_skb;
if (skb->len > dev->mtu + dev->hard_header_len) {
pskb_trim(skb, dev->mtu + dev->hard_header_len);
@@ -634,20 +559,16 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev)
truncate, true);
proto = htons(ETH_P_ERSPAN2);
} else {
- goto err_free_rt;
+ goto err_free_skb;
}
gre_build_header(skb, 8, TUNNEL_SEQ,
proto, 0, htonl(tunnel->o_seqno++));
- df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
+ ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen);
- iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE,
- key->tos, key->ttl, df, false);
return;
-err_free_rt:
- ip_rt_put(rt);
err_free_skb:
kfree_skb(skb);
dev->stats.tx_dropped++;
@@ -656,13 +577,18 @@ err_free_skb:
static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
{
struct ip_tunnel_info *info = skb_tunnel_info(skb);
+ const struct ip_tunnel_key *key;
struct rtable *rt;
struct flowi4 fl4;
if (ip_tunnel_info_af(info) != AF_INET)
return -EINVAL;
- rt = gre_get_rt(skb, dev, &fl4, &info->key);
+ key = &info->key;
+ ip_tunnel_init_flow(&fl4, IPPROTO_GRE, key->u.ipv4.dst, key->u.ipv4.src,
+ tunnel_id_to_key32(key->tun_id), key->tos, 0,
+ skb->mark);
+ rt = ip_route_output_key(dev_net(dev), &fl4);
if (IS_ERR(rt))
return PTR_ERR(rt);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.